# Au 2.0: Downstream error after resolving a factory with a string

**URL:** <https://discourse.aurelia.io/t/au-2-0-downstream-error-after-resolving-a-factory-with-a-string/6557>\
**Category:** Framework Knowledge\
**Created:** [December 23, 2025, 5:53am UTC](https://discourse.aurelia.io/t/au-2-0-downstream-error-after-resolving-a-factory-with-a-string/6557 "2025-12-23T05:53:40Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![estaylorco](https://yyz1.discourse-cdn.com/flex027/user_avatar/discourse.aurelia.io/estaylorco/32/1887_2.png) [@estaylorco](https://discourse.aurelia.io/u/estaylorco)\
**Post date:** [December 23, 2025, 4:55pm UTC](https://discourse.aurelia.io/t/au-2-0-downstream-error-after-resolving-a-factory-with-a-string/6557/3 "2025-12-23T16:55:38Z")

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_(Please note that I do not, as of yet, use ts, only js)._

Sorry about that @bigopon . I had created a separate project in preparation for a repro, and I didn’t keep it up to the minute as I was wrestling with this in my main project. I understand why the naming conventions threw you. I just got into the office, and updated the isolated project.

**Nevertheless, the problem persists.** I use `Factory.of` all over the place in my Au 1.0 app (the one I’m migrating). I’m the one who posted this over 4 years ago ( [Will Factory.of() be supported in Aurelia 2?](https://discourse.aurelia.io/t/will-factory-of-be-supported-in-aurelia-2/4282) )🙂 !

I should have written this in the post:

```javascript
...
Registration.transient('ItbDocument', ItbDocument)
...

```

and where the factory is resolved:

```javascript
this.documentFactory = resolve(factory('ItbDocument'));

```

and where the factory is used:

```javascript
this.document = this.documentFactory();

```

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